Added support for decoration of the osgTerrain::DataSet generated databases

with a CoordinateSystemNode which reflect the coordinate system of the
database.

Added support for reading and writing CoordianteSystemNode into the .osg
and .ive formats.

src/osgPlugins/ive/DataOutputStream.cpp

@@ -49,6 +49,7 @@
 #include "Switch.h"
 #include "OccluderNode.h"
 #include "Impostor.h"
+#include "CoordinateSystemNode.h"
 
 #include "LightPointNode.h"
 #include "MultiSwitch.h"
@@ -611,6 +612,9 @@ void DataOutputStream::writeNode(const osg::Node* node)
         else if(dynamic_cast<const osg::Switch*>(node)){
             ((ive::Switch*)(node))->write(this);
         }
+        else if(dynamic_cast<const osg::CoordinateSystemNode*>(node)){
+            ((ive::CoordinateSystemNode*)(node))->write(this);
+        }
         else if(dynamic_cast<const osgSim::MultiSwitch*>(node)){
             ((ive::MultiSwitch*)(node))->write(this);
         }